阅读说明：本技术 一种复合含水层用中低温地热井利用系统 (Compound aquifer is with well low temperature geothermal well utilization system ) 是由 刘铮 戴志清 邬小波 刘少勇 程鹏 梁晗 胡青松 陈北领 于 2021-08-30 设计创作，主要内容包括：一种复合含水层用中低温地热井利用系统,包括复合含水层、上隔水层、潜水泵、开采井、地热水管路、板式换热器、地面工艺部、回灌井,所述复合含水层上侧连接上隔水层,所述开采井与回灌井穿过上隔水层插入复合含水层,所述开采井与回灌井相对设置,所述地热水管路中部设置板式换热器、地面工艺部,所述板式换热器设置在靠近开采井侧,所述地热水管路左端设置潜水泵,所述潜水泵插入开采井内,所述地热水管路右端插入回灌井内；所述复合含水层包括下含水层、下隔水层、上含水层,所述上含水层、下隔水层、下含水层在上隔水层下侧依次排列。(A middle-low temperature geothermal well utilization system for a composite aquifer comprises the composite aquifer, an upper water barrier, a submersible pump, a production well, a geothermal water pipeline, a plate heat exchanger, a ground process part and a recharge well, wherein the upper side of the composite aquifer is connected with the upper water barrier, the production well and the recharge well penetrate through the upper water barrier and are inserted into the composite aquifer, the production well and the recharge well are arranged oppositely, the plate heat exchanger and the ground process part are arranged in the middle of the geothermal water pipeline, the plate heat exchanger is arranged on the side close to the production well, the submersible pump is arranged at the left end of the geothermal water pipeline, the submersible pump is inserted into the production well, and the right end of the geothermal water pipeline is inserted into the recharge well; the composite aquifer comprises a lower aquifer, a lower water-resisting layer and an upper aquifer, wherein the upper aquifer, the lower water-resisting layer and the lower aquifer are sequentially arranged on the lower side of the upper water-resisting layer.)

1. The system is characterized by comprising a composite aquifer, an upper water barrier, a submersible pump, a production well, a geothermal water pipeline, a plate heat exchanger, a ground process part and a recharge well, wherein the upper side of the composite aquifer is connected with the upper water barrier, the production well and the recharge well penetrate through the upper water barrier and are inserted into the composite aquifer, the production well and the recharge well are arranged oppositely, the plate heat exchanger and the ground process part are arranged in the middle of the geothermal water pipeline, the plate heat exchanger is arranged on the side close to the production well, the submersible pump is arranged at the left end of the geothermal water pipeline, the submersible pump is inserted into the production well, and the right end of the geothermal water pipeline is inserted into the recharge well.

2. The system of claim 1, wherein the composite aquifer comprises a lower aquifer, a lower water barrier and an upper aquifer, and the upper aquifer, the lower water barrier and the lower aquifer are arranged in sequence under the upper water barrier.

3. The system as claimed in claim 2, wherein the geothermal water pipeline is made of glass fiber reinforced plastic, the plate heat exchanger is made of titanium plate, and the ground process unit is selected and combined according to actual conditions and comprises a cyclone sand remover, a coarse filter, a fine filter, an exhaust tank and the like.

4. The method of operating a medium and low temperature geothermal well exploitation system for a composite aquifer according to claim 3, comprising the steps of:

firstly, a recovery well utilizes a lower aquifer part of a composite aquifer during recharging, and a recharge well utilizes a lower aquifer part and an upper aquifer part of the composite aquifer;

secondly, extracting geothermal water by a submersible pump in the exploitation well, and entering a plate heat exchanger through a geothermal water pipeline to finish heat exchange;

and thirdly, the water after heat exchange enters a ground process part for treatment and then enters a recharge well to complete recharge.

Technical Field

The invention relates to the field of geothermal energy, in particular to a middle and low temperature geothermal well utilization system for a composite aquifer.

Background

The geothermal energy is natural heat energy stored in the earth, has the advantages of cleanness, high efficiency, stability, safety and the like, plays a unique role in the aspects of energy conservation and emission reduction, haze treatment, energy structure adjustment and the like, and particularly becomes a future main development direction in the field of building energy supply.

At present, the problems of low recharge efficiency of medium-deep hydrothermal geothermal systems, water source heat pump systems and the like exist in different degrees. The geothermal recharging is a powerful measure for realizing sustainable development of geothermal resources, is widely applied in various countries in the world, and has important significance for protecting geothermal resources, reducing resource waste, prolonging the service life of a production well, reducing environmental pollution and the like. Therefore, it is necessary to improve the recharge efficiency of geothermal water resources.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a medium-low temperature geothermal well utilization system for a composite aquifer, which can improve the recharge efficiency of geothermal water resources.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a compound aquifer is with well low temperature geothermal well utilizes system, includes compound aquifer, last water barrier, immersible pump, exploitation well, geothermal water pipeline, plate heat exchanger, ground technology portion, recharge the well, the water barrier is connected to compound aquifer upside, the exploitation well passes the water barrier with recharging the well and inserts compound aquifer, the exploitation well sets up with recharging the well relatively, geothermal water pipeline middle part sets up plate heat exchanger, ground technology portion, plate heat exchanger sets up and is being close to the exploitation well side, geothermal water pipeline left end sets up the immersible pump, the immersible pump inserts in the exploitation well, geothermal water pipeline right-hand member inserts in recharging the well.

The composite aquifer comprises a lower aquifer, a lower water-resisting layer and an upper aquifer, wherein the upper aquifer, the lower water-resisting layer and the lower aquifer are sequentially arranged on the lower side of the upper water-resisting layer.

The geothermal water pipeline is made of glass fiber reinforced plastic, the plate heat exchanger is made of titanium plates, and the ground process part selects and combines the components according to actual conditions and can comprise a cyclone sand remover, a coarse filter, a precise filter, an exhaust tank and the like.

Has the advantages that:

the invention uses the lower water layer of the composite aquifer, and the well-forming process can be selected from a one-opening large-caliber gravel filling process, a two-opening filter well-forming process, a two-opening perforation well-forming process and the like. The submersible pump is selected after accurate hydraulic calculation. The geothermal water pipeline is made of glass fiber reinforced plastic, and the proper pressure grade can be selected according to the actual situation. The plate heat exchanger is made of titanium plates. The ground process part of the invention selects combination according to actual conditions, and can comprise a cyclone desander, a coarse filter, a fine filter, an exhaust tank and the like. The recharging well of the present invention utilizes all water layers of the composite water-bearing stratum, and the well completion process can be selected from a one-opening large-caliber gravel filling process, a two-opening filter well completion process, a two-opening perforation well completion process, etc.

The invention relates to a production well and a recharge well which utilize water layers at different parts of a composite aquifer, and belong to the same aquifer, so that the water quality is the same, the water layers are not polluted, and the invention belongs to the same-layer recharge in the hydrological sense.

The well-forming process of the production well and the recharge well can adopt mature processes such as a one-opening large-caliber gravel filling process, a two-opening filter well-forming process, a two-opening perforation well-forming process and the like, and has strong selectivity.

The exploitation well only utilizes the lower water layer of the composite aquifer, and the water temperature rises although the water quantity is reduced, so that the use effect is not influenced; the recharge well utilizes all water layers of the composite aquifer, increases the length of the aquifer segment, improves the utilization area of the reservoir, obviously increases the recharge quantity and ensures a one-mining one-recharging development and utilization mode. Particularly in the area of the composite water-containing layer with high ground temperature gradient, the design is proper, and the development and utilization modes of three-mining two-irrigation and four-mining three-irrigation can be realized.

The pipeline, the valve and other materials are all made of glass fiber reinforced plastic, so that the pipeline and valve anti-aging coating has the advantages of high strength, strong impact resistance, good temperature resistance, strong anti-aging capability, strong designability of corrosion resistance and capability of selecting resin types according to different corrosion environment types.

The ground process part of the invention selectively combines the cyclone desander, the coarse filter, the fine filter and the exhaust tank according to the actual situation, thereby effectively solving the problem of blockage.

Taking a geothermal well as an example, when the original exploitation well utilizes all the composite aquifers, the water quantity is 100 m/h, the available temperature is 5 ℃, and then 581.5kw of heat can be provided, when the exploitation well utilizes the lower water layer of the composite aquifers instead, the water quantity is reduced to 70 m/h, but the water temperature is increased, the available temperature reaches 7 ℃, and then 569.87kw of heat can be provided, and the use effect is not influenced.

During recharging, the exploiting well utilizes the lower aquifer-part of the composite aquifer, the recharging well utilizes the lower aquifer-and upper aquifer-parts of the composite aquifer, geothermal water is extracted by a submersible pump in the exploiting well, enters a plate heat exchanger through a geothermal water pipeline to complete heat exchange, then enters a ground process part to be treated, and enters the recharging well to complete recharging.

The above detailed description of a medium and low temperature geothermal well utilization system for a composite aquifer with reference to the embodiments is illustrative and not restrictive, and thus variations and modifications thereof without departing from the general concept of the present invention are intended to be within the scope of the present invention.

Drawings

Fig. 1 is a schematic structural diagram of a medium-low temperature geothermal well utilization system for a composite aquifer.

Detailed Description

The invention is explained in more detail below with reference to the figures and examples:

the utility model provides a compound aquifer is with well low temperature geothermal well utilizes system, includes compound aquifer, upper water barrier 2, immersible pump 3, exploitation well 4, geothermal water pipeline 5, plate heat exchanger 6, ground technology portion 7, recharge well 8, compound aquifer upside is connected upper water barrier 2, exploitation well 4 passes upper water barrier 2 with recharge well 8 and inserts compound aquifer, exploitation well 4 sets up with recharge well 8 relatively, geothermal water pipeline 5 middle part sets up plate heat exchanger 6, ground technology portion 7, plate heat exchanger 6 sets up and is being close to exploitation well 4 side, geothermal water pipeline 5 left end sets up immersible pump 3, immersible pump 3 inserts in the exploitation well 4, geothermal water pipeline 5 right-hand member inserts in recharge well 8.

The composite aquifer comprises a lower aquifer 1-1, a lower water barrier 1-2 and an upper aquifer 1-3, wherein the upper aquifer 1-3, the lower water barrier 1-2 and the lower aquifer 1-1 are sequentially arranged on the lower side of the upper water barrier 2.

The geothermal water pipeline 5 is made of glass fiber reinforced plastic, the plate heat exchanger 6 is made of titanium plates, and the ground process part 7 is selected and combined according to actual conditions and can comprise a cyclone sand remover, a coarse filter, a precision filter, an exhaust tank and the like.

The invention adopts the lower water layer of the composite aquifer as the exploitation well 4, and the well-forming process can adopt a one-opening large-caliber gravel filling process, a two-opening filter well-forming process, a two-opening perforation well-forming process and the like. The submersible pump 3 is selected after accurate hydraulic calculation. The geothermal water pipeline 5 is made of glass fiber reinforced plastic, and the appropriate pressure grade can be selected according to the actual situation. The plate heat exchanger 6 is made of titanium plates. The ground process part 7 of the invention selects combination according to actual conditions, and can comprise a cyclone sand remover, a coarse filter, a fine filter, an exhaust tank and the like. The recharging well 8 of the invention utilizes all water layers of the composite aquifer, and the well completion process can select a one-opening large-caliber gravel filling process, a two-opening filter well completion process, a two-opening perforation well completion process and the like.

The exploitation well 4 and the recharge well 8 of the invention utilize water layers at different parts of the composite aquifer, and because the water layers belong to the same aquifer, the water quality is the same, the water layers are not polluted, and the invention belongs to the same-layer recharge in the hydrological sense.

The well completion process of the production well 4 and the recharge well 8 can adopt mature processes such as a one-opening large-caliber gravel filling process, a two-opening filter well completion process, a two-opening perforation well completion process and the like, and has strong selectivity.

The exploitation well 4 only utilizes the lower water layer of the composite aquifer, and the water temperature rises although the water quantity is reduced, so that the use effect is not influenced; the recharge well 8 utilizes all water layers of the composite aquifer, increases the length of the aquifer segment, improves the utilization area of the reservoir, obviously increases the recharge quantity and ensures a one-mining one-recharging development and utilization mode. Particularly in the area of the composite water-containing layer with high ground temperature gradient, the design is proper, and the development and utilization modes of three-mining two-irrigation and four-mining three-irrigation can be realized.

The pipeline, the valve and other materials are all made of glass fiber reinforced plastic, so that the pipeline and valve anti-aging coating has the advantages of high strength, strong impact resistance, good temperature resistance, strong anti-aging capability, strong designability of corrosion resistance and capability of selecting resin types according to different corrosion environment types.

The ground process part 7 of the invention selectively combines the cyclone desander, the coarse filter, the fine filter and the exhaust tank according to the actual situation, thereby effectively solving the problem of blockage.

Taking a geothermal well as an example, when the original exploitation well utilizes all the composite aquifers, the water quantity is 100 m/h, the available temperature is 5 ℃, and then 581.5kw of heat can be provided, when the exploitation well utilizes the lower water layer of the composite aquifers instead, the water quantity is reduced to 70 m/h, but the water temperature is increased, the available temperature reaches 7 ℃, and then 569.87kw of heat can be provided, and the use effect is not influenced.

During recharging, the exploiting well 4 utilizes the part 1-1 of the lower aquifer of the composite aquifer, the recharging well 8 utilizes the parts 1-1 of the lower aquifer and the part 1-3 of the upper aquifer of the composite aquifer, geothermal water is extracted by a submersible pump 3 in the exploiting well 4, enters a plate heat exchanger 6 through a geothermal water pipeline 5 to complete heat exchange, then enters a ground process part 7 to be treated, and then enters the recharging well 8 to complete recharging.

The above detailed description of a medium and low temperature geothermal well utilization system for a composite aquifer with reference to the embodiments is illustrative and not restrictive, and thus variations and modifications thereof without departing from the general concept of the present invention are intended to be within the scope of the present invention.

An operation method of a middle and low temperature geothermal well utilization system for a composite aquifer comprises the following steps:

1. the recovery well 4 utilizes the part 1-1 of the lower aquifer of the compound aquifer during recharging, and the recharging well 8 utilizes the parts 1-1 of the lower aquifer and 1-3 of the upper aquifer of the compound aquifer;

2. geothermal water is extracted by a submersible pump 3 in a production well 4 and enters a plate heat exchanger 6 through a geothermal water pipeline 5 to complete heat exchange;

3. and the water after heat exchange enters the ground process part 7 for treatment and then enters the recharge well 8 to complete recharge.